---
title: "Treasury auction tails sample (JSON)"
method: GET
path: "/api/seo/auction-tails"
tags: ["Treasury auctions"]
---

# Treasury auction tails sample (JSON)

`GET /api/seo/auction-tails`

## Request

- Base URL: `https://api.helious.io`
- URL: `https://api.helious.io/api/seo/auction-tails`
- Auth: none declared

The recent slice of the cross-tenor auction dataset: the tail (high yield minus when-issued), bid-to-cover, bidder split and desk verdict per auction. A capped sample; the full history comes through /v1/auctions, where depth follows your plan.

## Response `200`

Auction tails

- object

---

[API](https://skmtc.dev/helious/apis/helious-public-api.md) · [All operations](https://skmtc.dev/helious/apis/helious-public-api/llms.txt) · [OpenAPI document](https://skmtc.dev/helious/apis/helious-public-api/revisions/06bada17ad7a?raw)